时间排序工具类

  /**   * 时间排序工具类   * @author shanjingjing   *   */public class TimeSequence implements Comparator{      public int compare(Object arg0,Object arg1){      FileElement file0 = (FileElement)arg0;      FileElement file1 = (FileElement)arg1;     SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd HH:mm");    String s1=sd.format(file0.getCreateTime());    String s2=sd.format(file1.getCreateTime());        int flag = s1.compareTo(s2);          return -flag;      }      }  

如何调用：

public List  orderByDate(List<FileElement> fs) {TimeSequence sort = new TimeSequence();  Collections.sort(fs,sort);        return fs;}

返回一个从大到小的List